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�' ■ KLEINFELDER 7 ASSUMPTIONS This revised workplan is based on the following assumptions: • This revised workplan has been prepared as a limited evaluation of the soil and groundwater at the site and is based upon the ESA report conclusions and recommendations prepared by Kleinfelder (dated April 1, 2003), and the RWQCB's requirement to supply a workplan to address the characterization of soil and groundwater at the site (letter dated April 26, 2002). The ESA was an interim step in developing this workplan as presented to the client and the RWQCB in Kleinfelder's proposal dated January 15, 2003. • Kleinfelder assumes it will be contracted for the work in a timely fashion. • Kleinfelder will be supplied with written authorization from the property owner to obtain access to the site to install and sample the wells. • Adequate work space and access will be provided. • Drilling/sampling derived wastes will be generated during the proposed investigation. Excess drilling returns will be contained in labeled DOT-approved 55-gallon drums and left on site. Water generated during well development/purging/sampling and water derived from equipment decontamination will be contained in DOT-approved 55-gallon drums and will be left on site. Disposal of all drilling/sampling derived wastes is the responsibility of Ms. Schmiedt. • Ms. Schmiedt should be aware that penetrating the site's surface is inherently risky. It is impossible to determine with certainty the precise location of all structures (such as septic system tanks or leach fields) which may be buried in the ground. Kleinfelder's fee is not adequate to compensate for both the performance of the services and the assumption of risk of damage to such structures. If the active septic system or utilities on site are damaged by our field activities, repairs will be necessary in order to provide continued service. Repairs are not included in Kleinfelder's fees. • Underground Services Alert (USA) at 1-800-642-2444 provides a partial location service free of charge for major utility lines. It is important that the client understand that subsurface structures (such as the septic systems, irrigation lines, leach fields, et cetera) buried under private property will not be marked by the public utility companies contacted by USA. Kleinfelder will require the drilling subcontractor to contact USA. 27125.E01 /ST03R657 Page 13 of 15 Copyright 2003,Kleinfelder,Inc. May 23,2003